When those firms bought Mervyns from Target (TGT) for $1.2 billion in 2004, they promised to revive the limping West Coast retailer. Then they stripped it of real estate assets, nearly doubled its rent, and saddled it with $800 million in debt while sucking out more than $400 million in cash for themselves, according to the company. The moves left Mervyns so weak it couldn't survive.

Mervyns' collapse reveals dangerous flaws in the private equity playbook. It shows how investors with risky business plans, unrealistic financial assumptions, and competing agendas can deliver a death blow to companies that otherwise could have survived. And it offers a glimpse into the human suffering wrought by owners looking to turn a quick profit above all else.